Dan Armstrong made a lasting mark on the music industry with his creations. Among his most well known and memorable designs would be the plexiglass guitars and basses, making their appearance in the 60's and reissued by Ampeg much more recently, and the classic Orange Squeezer compressor that simply plugged directly into a guitar's 1/4" jack. Other Dan Armstrong designs include the Purple Peaker and Green Ringer effects.

Even after reaching the traditional age of retirement, he didn't stop creating new goodies for musicians. Together with Vintage Tone Project, he created the Orange Crusher, an updated version of the classic Orange Squeezer in a pedal format, and drove development of the recently patented Articulator effect, designed to emphasize and bring out dynamics in instruments. According to the Dan Armstrong web site he's also been involved with the design of a new guitar amp and several other products that were expected to be announced in the coming months.